[ Yuuki can't really say why she is. Maybe she's needed to express her feelings all this time. And everyone else in Kiseki knows who her brother is. But someone new... who's never met him before- it's a different story.
Quiet as well, she just smiles sadly, and nods. But, in an effort to disrupt the heavy mood, she paints on a bit of enthusiasm and glances back up. ]
Anyway! Sorry about that. You don't really know him and he's gone now, so I shouldn't mope. Siblings can be complicated at times.
[ And that can be an understatement. Especially when there's romantic feelings involved. ]
Do you have a brother or sister? [ Maybe it's easier to shift the focus off of herself for a little bit. ]